Gmail is rejection emails from mail server

Web VPS

Hi , recently gmail delivery is not possible from my vps server. This was a backup server and was not used much. It has ipv6 on it. The ipv4 is not in any blacklist. When sending email to gmail i get a reply: SMTP error from remote mail server after end of data: host aspmx.l.google.com [2a00:1450:400c:c05::1a]: 550-5.7.1 [2a00:d880:3:1::d2de:3f34 1] Our system has detected an unusual 550-5.7.1 rate of unsolicited mail originating from your IP address. To protect 550-5.7.1 our users from spam, mail sent from your IP address has been blocked. 550-5.7.1 Please visit http://www.google.com/mail/help/bulk_mail.html to review 550 5.7.1 our Bulk Email Senders Guidelines. h15si5313771wic.51 - gsmtp

is it possible to only use ipv4 for mail delivery? should i ask the provider to remove ipv6 from my vps.? i am running centos 6.5

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